Magnetic substrates, composition and method for making the same

• US 20060165880A1
• Filed: 03/28/2006
• Published: 07/27/2006
• Est. Priority Date: 11/26/2000
• Status: Abandoned Application

• Current Assignee: Randall A. Boudouris, Raymond S. Richards
• Original Assignee: Randall A. Boudouris, Raymond S. Richards
• Inventors: Richards, Raymond S., Boudouris, Randall A.
• Application Number:
  US11/390,567
• Publication Number:
  US 20060165880A1
• Time in Patent Office: Days
• US Class Current: 427/127
• CPC Class Codes: B32B 2307/208 Magnetic, paramagnetic
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 37/153 at least one layer is extruded and immediately laminated while in semi-molten state
• CPC Class Codes: B32B 38/145 Printing
• CPC Class Codes: G09F 7/04 the elements being secured or adapted to be secured by magnetic means
• CPC Class Codes: H01F 1/0027 Thick magnetic films forming thick magnetic films H01F41/16
• CPC Class Codes: H01F 41/16 the magnetic material being applied in the form of particles, e.g. by serigraphy , to form thick magnetic films or precursors therefor H01F41/18 -H01F41/24 take precedence
• CPC Class Codes: Y10T 428/31993 Of paper

Abstract

A process of making a magnetic assembly having at least one magnetic layer and at least one printable substrate layer including the steps of providing a magnetic composition comprising about 70 wt-% to about 95 wt-% of at least one magnetic material and about 5 wt-% to about 30 wt-% of at least one thermoplastic binder, forming the magnetic composition into a magnetic layer, and directly applying the magnetic composition at an elevated temperature in molten form to a printable substrate layer, and to the magnetic composition and any articles made therefrom.

Claims

1-60. -60. (canceled)

61. A process of forming a magnetic assembly having at least one magnetic layer having dimensions of thickness, width and length, and at least one printable substrate layer having dimensions of thickness, width and length, comprising the steps of:

a) providing a magnetic hot melt composition at a temperature between about 135°

C. and about 205°

C. with an extruder which is a single screw or double screw extruder, the magnetic hot melt composition comprising about 80 wt-% to about 95 wt-% of at least one magnetic material and about 5 wt-% to about 20 wt-% of at least one thermoplastic binder selected from copolymers of ethylene and vinyl acetate and mixtures thereof;

b) directly applying said magnetic hot melt composition with a slot die head at an elevated temperature when it is pliable to a printable substrate layer, the printable substrate layer formed of paper.

62. The method of claim 61 wherein said magnetic hot melt composition is provided with a single screw extruder.

63. The method of claim 61 wherein said magnetic hot melt composition is applied at a temperature between about 135°

C. and about 190°

C.

64. The method of claim 61 wherein said magnetic hot melt composition comprises about 85 wt-% to about 95 wt-% of said at least one magnetic material and about 5 wt-% to about 15 wt-% of said at least one thermoplastic binder selected from copolymers of ethylene and vinyl acetate and mixtures thereof.